Add shell command so tests aren't hindered.

Add a shell command that allows tests to temporarily exempt themselves
from all TARE policy.

Bug: 242294488
Test: set battery level to 10%, unplug, then:
Test: atest --rerun-until-failure 100 CtsOsTestCases:AppHibernationIntegrationTest
Test: atest --rerun-until-failure 100 CtsOsTestCases:AutoRevokeTest
Test: atest --rerun-until-failure 100 CtsPermissionTestCases:NotificationListenerCheckTest
Test: atest --rerun-until-failure 100 CtsPermissionTestCases:LocationAccessCheckTest
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/tare
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/tare
Change-Id: I95f3c2ad27c603c94784d13d5c75db4e58ade974